How do I fix this? I have not finished with my explanations yet but I do that at the end in case I need to change things.

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# Set definiton
def rep_words(replace, sentence):
    # Split the words in definition
    words = sentence.split()
    
    # 
    for i in range(0, len(words)):
        # 
        if words[i] in replace:
            # 
            words[i] = replace[words[i]]
    
    # 
    rep_sentence = ' '.join(words)
    # 
    return rep_sentence

# 
rep_input = input().split()

# 
for i in range(0, len(rep_input), 2):
    # 
    first_word = rep_input[i]
    # 
    rep_words = rep_input[i + 1]
    # 
    replace[first_word] = rep_words

# 
sentence = input()
# 
rep_sentence = rep_words(replace, sentence)
# Print the output
print(rep_sentence)

What I have tried:

Here is my most recent error message.

Traceback (most recent call last):
  File "main.py", line 28, in <module>
    replace[first_word] = rep_words
NameError: name 'replace' is not defined

Posted 6-Aug-23 11:15am

Mathew Helvey

Updated 6-Aug-23 18:13pm

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2 solutions

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Mike Hankey · Answer 1 · 2023-08-06T12:18:00

Solution 1

As the error says Replace is not defined. See this turorial for reference; Python String replace() Method[^]

Below is how it is supposed to be used

C++

x = txt.replace("bananas", "apples")

Posted 6-Aug-23 12:18pm

Mike Hankey

OriginalGriff · Answer 2 · 2023-08-06T18:13:00

In Python, indentation is significant: every contiguous line that is indented to the same level is part of the same block of code.
So when you define a function, the entire block of code needs to be indented to at least the same level:

Python

def foo(bar):
   # in the function
   if (bar == "Hello world"):
      print(bar)
   else:
      print("Not bar")
# Not in the function
foo("Hello World")

In addition to that, there are scope rules: variables only exist while they are in scope - which means within the block of code that they are defined.

Python

def foo(bar):
   # bar exists here
   if (bar == "Hello world"):
      print(bar)
   else:
      print("Not bar")
# Not in the function
# bar is out of scope now
foo("Hello World")
print (bar) # Throws an error because bar doesn't exist.

So in your code, replace is a parameter to the rep_words function, and can't be accessed outside it:

Python

def rep_words(replace, sentence):
    # Split the words in definition
...
    return rep_sentence 

# 
rep_input = input().split()

# 
for i in range(0, len(rep_input), 2):
...
    replace[first_word] = rep_words # "replace" does not exist.

You need to decide what replace is, and where it can be accessed, and call your function with the required parameters!